Question

Some volunteers are going to              the central park. Let's join them.

A.put up B.clean up C.look up D.give up

Answer

B

【解析】

句意：一些志愿者打算去清扫中央公园。让我们加入他们吧。

考查动词短语。put up张贴；clean up清扫；look up向上看，查阅；give up放弃。根据空后“the central park”，结合选项可推出是说清扫中央公园，用clean up符合题意。故选B。